haswell: Add initial support for Haswell platforms

The Haswell parts use a PCH code named Lynx Point (Series 8). Therefore,
the southbridge support is included as well. The basis for this code is
the Sandybridge code. Management Engine, IRQ routing, and ACPI still requires
more attention, but this is a good starting point.

This code partially gets up through the romstage just before training
memory on a Haswell reference board.

Change-Id: If572d6c21ca051b486b82a924ca0ffe05c4d0ad4
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: http://review.coreboot.org/2616
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>

1 files changed, 101 insertions, 0 deletions

diff --git a/src/southbridge/intel/lynxpoint/bootblock.c b/src/southbridge/intel/lynxpoint/bootblock.c
new file mode 100644
index 0000000000..2770d55cad
--- /dev/null
+++ b/src/southbridge/intel/lynxpoint/bootblock.c
@@ -0,0 +1,101 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2011 Google Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <arch/io.h>
+#include <arch/romcc_io.h>
+#include <cpu/x86/tsc.h>
+#include "pch.h"
+
+static void store_initial_timestamp(void)
+{
+	/* On Cougar Point we have two 32bit scratchpad registers available:
+	 * D0:F0  0xdc (SKPAD)
+	 * D31:F2 0xd0 (SATA SP)
+	 */
+	tsc_t tsc = rdtsc();
+	pci_write_config32(PCI_DEV(0, 0x00, 0), 0xdc, tsc.lo);
+	pci_write_config32(PCI_DEV(0, 0x1f, 2), 0xd0, tsc.hi);
+}
+
+/*
+ * Enable Prefetching and Caching.
+ */
+static void enable_spi_prefetch(void)
+{
+	u8 reg8;
+	device_t dev;
+
+	dev = PCI_DEV(0, 0x1f, 0);
+
+	reg8 = pci_read_config8(dev, 0xdc);
+	reg8 &= ~(3 << 2);
+	reg8 |= (2 << 2); /* Prefetching and Caching Enabled */
+	pci_write_config8(dev, 0xdc, reg8);
+}
+
+
+static void map_rcba(void)
+{
+	device_t dev = PCI_DEV(0, 0x1f, 0);
+
+	pci_write_config32(dev, RCBA, DEFAULT_RCBA | 1);
+}
+
+static void enable_port80_on_lpc(void)
+{
+	/* Enable port 80 POST on LPC. The chipset does this by deafult,
+	 * but it doesn't appear to hurt anything. */
+	u32 gcs = RCBA32(GCS);
+	gcs = gcs & ~0x4;
+	RCBA32(GCS) = gcs;
+}
+
+static void set_spi_speed(void)
+{
+	u32 fdod;
+	u8 ssfc;
+
+	/* Observe SPI Descriptor Component Section 0 */
+	SPIBAR32(FDOC) = 0x1000;
+
+	/* Extract the Write/Erase SPI Frequency from descriptor */
+	fdod = SPIBAR32(FDOD);
+	fdod >>= 24;
+	fdod &= 7;
+
+	/* Set Software Sequence frequency to match */
+	ssfc = SPIBAR8(SSFC + 2);
+	ssfc &= ~7;
+	ssfc |= fdod;
+	SPIBAR8(SSFC + 2) = ssfc;
+}
+
+static void bootblock_southbridge_init(void)
+{
+#if CONFIG_COLLECT_TIMESTAMPS
+	store_initial_timestamp();
+#endif
+	map_rcba();
+	enable_spi_prefetch();
+	enable_port80_on_lpc();
+	set_spi_speed();
+
+	/* Enable upper 128bytes of CMOS */
+	RCBA32(RC) = (1 << 2);
+}